Abstract
Biological neutralisation of pH, driven by the microbial fermentation of added organic carbon substrates such as glucose, has recently emerged as a promising technique for remediation of bauxite residue , dropping pH from >11 to <8 in five days. Here, we report on a glasshouse experiment combining this novel microbially-driven pH neutralisation technology with other existing (abiotic) remediation approaches, including addition of gypsum, sewage sludge , and irrigation. Scaling up the bioremediation treatment by three orders of magnitude from previous laboratory trials to these glasshouse trials was successful. Adding bioremediated residue (5 cm thick) at the residue surface significantly enhanced pH neutralisation to depth, decreasing pH from 13 to ~10 as far as 25 cm below the residue surface. Increasing irrigation and tillage frequency accelerated salt removal. Combining our microbial bioneutralisation treatment with fortnightly tillage and daily irrigation provided the best opportunity to rapidly decrease pH and salinity , and is currently being trialled at field scale.
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References
Courtney RG, Jordan SN, Harrington T (2009) Physico-chemical changes in bauxite residue following application of spent mushroom compost and gypsum. Land Degradation and Development, 20, 572–581.
Eastham J, Morald T, Aylmore P (2006) Effective nutrient sources for plant growth on bauxite residue. I. Comparing organic and inorganic fertilisers. Water, Air, and Soil Pollution, 176, 5–19.
Fuller RD, Nelson EDP, Richardson CJ (1982) Reclamation of red mud (bauxite residues) using alkaline-tolerant grasses with organic amendments. Journal of Environmental Quality, 11, 533–539.
Graefe M, Klauber C (2011) Bauxite residue issues. IV. Old obstacles and new pathways for in situ residue bioremediation. Hydrometallurgy, 108, 46–59.
Power G, Gräfe M, Klauber C (2011) Bauxite residue issues: I. Current management, disposal and storage practices. Hydrometallurgy, 108, 33–45.
Santini, T.C., Banning, N.C. (2016) Alkaline tailings as novel soil-forming substrates: reframing perspectives on mining and refining wastes. Hydrometallurgy, 164, 38–47.
Santini, T.C., Fey, M.V. (2016) Assessment of Technosol formation and in situ remediation in capped alkaline tailings. Catena, 136, 17–29.
Santini, T.C., Fey, M.V., Smirk, M.N. (2013) Evaluation of soil analytical methods for the characterisation of alkaline Technosols: I. Moisture content, pH, and electrical conductivity. Journal of Soils and Sediments, 13, 1141–1149.
Santini, T.C., Kerr, J.L., Warren, L.A. (2015a) Microbially-driven strategies for bioremediation of bauxite residues. Journal of Hazardous Materials, 293, 131–157.
Santini, T.C., Malcolm, L.I., Tyson, G.W., Warren, L.A. (2016) pH and organic carbon dose rates control microbially-driven bioremediation efficacy in alkaline bauxite residue. Environmental Science and Technology, 50, 11164–11173.
Santini, T.C., Warren, L.A., Kendra, K.E. (2015b) Microbial diversity in engineered haloalkaline environments shaped by shared geochemical drivers observed in natural analogues. Applied and Environmental Microbiology, 81, 5026–5036.
Wong JWC, Ho G (1994) Sewage sludge as organic ameliorant for revegetation of fine bauxite refining residue. Resources, Conservation, and Recycling, 11, 297–309.
Wong JWC, Ho GE (1991) Effects of gypsum and sewage sludge amendment on physical properties of fine bauxite refining residue. Soil Science, 152, 326–332.
Woodard HJ, Hossner L, Bush J (2008) Ameliorating caustic properties of aluminium extraction residue to establish a vegetative cover. Journal of Environmental Science and Health Part A, 43, 1157–1166.
Acknowledgements
The authors gratefully acknowledge financial support for this study from the Australian Government’s Australian Research Council Linkage Projects programme (LP160100207), the International Aluminium Institute, and Alcoa of Australia Limited, and the technical and logistical support of Alcoa of Australia Limited in providing bauxite residue for this study.
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© 2019 The Minerals, Metals & Materials Society
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Santini, T.C. et al. (2019). Accelerating Bauxite Residue Remediation with Microbial Biotechnology. In: Chesonis, C. (eds) Light Metals 2019. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-05864-7_10
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DOI: https://doi.org/10.1007/978-3-030-05864-7_10
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